Radial force characteristics of impeller during variable frequency speed regulation process of double-suction centrifugal pump
In order to study the force characteristics of the impeller in the variable frequency regulation(VFR)process of a centrifugal pump,a single-stage double-suction centrifugal pump was taken as the research object.The flow field inside the pump was numerically simulated under two types of variable speed regulation laws of linear and nonlinear.The radial force on the impeller and the pressure changes in the flow channel during the variable speed process were analyzed.The results indicate that the rate of change in rotational speed plays a dominant role in the variation of radial force under different rota-tional speed processes.There is a slight difference in the vector distribution of radial force in the cir-cumferential direction during the two types of variable speed processes.When subjected to non-linear changes,the force in each direction is more uniform,which is more conducive to the stable operation of the equipment.Compared to the constant speed operating conditions corresponding to different times,the radial force under variable speed conditions is relatively large,with the most obvious effect at 0.11 s.Moreover,the nonlinear change process shows a greater increase in radial force value,reaching 534 N.In the process of variable frequency regulation,the pulsation frequency of radial force is mainly low frequency.Compared to other parts,the pressure change at the outlet of the impeller is more signifi-cant,which causes the force change at the outlet of the impeller and is a direct factor affecting the magnitude of radial force.
double-suction centrifugal pumpvariable frequency regulationradial forcenumerical simulation
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